Teres major

Posterior aspect of the inferior angle of the scapula

Medial lip of the intertubercular sulcus of the humerus

The Teres major is a medial rotator and adductor of the humerus and assists the Latissimus dorsi in drawing the previously raised humerus downward and backward. It also helps stabilize the humeral head in the glenoid cavity.

Lower subscapular nerve (segmental levels C5 and C6)

Subscapular and circumflex scapular arteries

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Relations:

The tendon, at its insertion, lies behind that of the Latissimus dorsi, from which it is separated by a bursa, the two tendons being, however, united along their lower borders for a short distance.

Together with teres minor muscle, teres major muscle forms the axillary space, through which several important arteries and veins pass.

The teres major muscle is innervated by the lower subscapular nerve of the brachial plexus.